William h



(No Model.)

W. H. HILL. GOLD GONGENTRATOR.

' No. 474,014. Patented May 3, 1892.

Unrrnn STATES PATENT rFicE.

WILLIAM H. HILL, OF ATLANTA, GEORGIA.

GOLD-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 474,014, dated May 3,1892.

Application filed November 17, 1891. Serial No. 412.235. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM H. HILL, of Atlanta,in the countyof Fultonand State of Georgia, haveinvented certain new and useful Improvementsin Gold-Concentrators; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersof reference marked thereon,which form a part of this specification.

This invention relates to devices for obtaining gold from pulverizedmaterial, eithernaturally so or made so in any of the well-knownpulverizing devices, the d evice being arranged to deposit the gold bygravity in such a position that it may be gathered without the use ofquicksilver, attention being also given to so constructing the machineas to render it easily transportable by whatever means are at hand,easily reassembled and set in operation, and operated with economy ofwater,

the details of construction whereby all these ends are attained beinghereinafter fully set forth, and illustrated in the accompanyingdrawings, in which said drawings Figure 1 is a side elevation of thedevice, showing a portion of a water-induction pipe. Fig. 2 is an endelevation of the same, the view being taken from the right-hand end ofFig. 1 and further showing the elements of construction shown in saidFig. 1. Fig. 3 is a longitudinal vertical section on the center of theframe, showing the formation and interior construction of parts and moreclearly showing the device than either of the previously-describedfigures. Fig. 4: is a view of the left-hand end of Fig. 1, said Viewbeinga profile only of the end stated, and the object of said figurebeing to show the means for vertical adjustment of the pan or shakermore clearly than has been heretofore done. Fig. 5 is a detail of thepan proper, said pan proper being the reservoir or sifter attached tothe riffle. portion of the pan, and shows the screen, its meansforvertical adjustment in the siftercasing, and the sidewise extensionof said screen imperforate, for a purpose hereinafter specified. Fig. 6is a detail in plan of the box carrying the ball-bearing for thewrist-pin of the oscillating crank. Fig. 7 is a vertical cross-sectionof Fig. 6,showing the conformation of the interior of the saidball-bearing box.

In the figures like reference marks are employed in the designation ofcorresponding elements of construction.

The frame A may be of any construction, so long as it is adapted tosustain the operative elements, and should be constructed, if compatiblewith the particular requirements otherwise, so as to be easily knockeddown for transportation by packing over mountainous country, as themachine is especially adaptable to prospecting on a large scale, as wellas working for the commercial production of gold. In the constructionshown the said frame comprises two top and bottom frames a, rectangularin shape and secured together at the proper vertical distance apart byuprights a. Between the side pieces of the top frame a is suitablysupported the strainer a which has a perforated bottom 0. and into whichsaid strainer the conduit. a empties its supply of water, which inpassing is a much smaller quantity than is generally necessary per tonof gold-carrying material,

which is thought to show a superior precipitating quality of themachine.

The rocker or pan B is somewhat narrower than the inside dimension inwidth of the frame and is carried and oscillated therein, as will bepresently described. This pan, as shown best in Fig. 3, is composed of abottom portion 1), which has on its top side within the sides I)corrugations or riftles 6 one of which (the riffle h is larger anddeeper than the others farther on as the water, 820., progress inoperation. The heavier particles of gold settle in this riftle, togetherwith some of the floating gold, while all of the floating gold and theparticles dislodged or separated later are precipitated into the otherriffles. Seated over the riflie b is a screen 12 composed of a casinghaving a screen b in its bottom, which is inclined, as shown in Fig. 3,and which inclination is adjustable by moving the higher end of thescreen up or down by? raising or lowering the rod 12 secured thereto andheld stationary by a screw-clip b passing through the side of the casingand tightened by the thumb-nut shown. The bottom or screen b has anextension D outside ward be shaken off and fall to the ground,

being refuse of the process by reason of being too heavy to pass theriffles, and which should either be pulverized or discarded entirely,according to the average yield of gold therefrom. One end of the pan Bis held in a stirrup b suspended upon a screw b ,passing through the topframe a, by a chain 1) while the other end is upheld in such a manner asto have motion endwise and sidewise and in all directions horizontal thecombination of such motions by the arm b, which has a universal joint Z9incorporated in it, one end of said arm being secured to the lower framea and the other being secured to the pan B, all of which isclearly'shown in Fig. 3.

J ournaled in a bearing-box on a cross-piece of the frame is a shaft 0,which carries a crank c and a pinion c, which said pinion engages with aspur-gear c on the shaft 0 journaled on the frame and carrying a crankfor manual operation or a tight and loose pulley or other device fordriving from power.

Secured to the end of the pan B is a bearing-box b having a perforatedball in a correspondingly-sph erical seat in its central portion, andthrough the mentioned hole in this sphere passes the wrist-pin of thecrank c, said ball having free play upon said wrist-pin. By means ofthis construction it is obvious that the pan receives a motion in alldirections substantially in a horizontal plane, together with a slightvertical motion owing to and governed by the pivoting and length of theupper member of the arm I), respectively. These motions cause anagitation of the water superiorly adapted to the precipitation of thefine and flake gold and the progression of the water and material alongthe riffles by a suddenly intermitting motion, which is conducive to theobtaining of the very best results. A sudden jar is given to the pan byits contacting forcibly when in motion with the buffers I), set in thecorner-posts of the frame A and preferably, though not necessarily,elastic in their com position,wl1ich sudden jar will cause the certainprecipitation of the flake-gold, which would possibly escape otherwise,although it is found that the suddenly-changing intermittent motion ofthe water will generally cause this precipitation. It is necessary tocause this gold to out below the surface of the water to cause it tofall. The uppermost end of the pan may be raised or lowered by causingthe handle Z9 to revolve in the proper direction, and the throw or sloshof the pan may be increased or diminished by changing in the properdirection and degree the throw of the crank c, (the crankarm beingslotted and the wrist-pin movable therein, if desired,) whichadjustments, together-with the adjustment hereinbefore mentioned, makethis device completely adjustable to the needs and wishes ofany'operator.

In cleaning the pan the end will be dropped down approximately to theposition indicated by broken lines in Fig. 1 and the gold and black sandscraped from the riffies, after which any Well-known separatingoperation may be performed. 4

In this device the loss of quicksilver by flowering is entirelyobviated, as the amalgamation takes place in dry riffles, thewatersupply being cut off before the process of amalgamation iscommenced. The amalgamation may of course be performed after the goldand sand are placed in a suitable vessel.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is

In a device of the class specified, a frame and a cradlesuspendedtherein carrying a spherical bearing-box on its end, a crank and shaftrevolubly mounted in said frame, and a perforated ball having end-playupon the wrist-pin of the said crank and seated and freely rotatablewithin the said spherical bearing-boX for the purpose of imparting tothe said cradle the requisite compound motion, for the purposespecified.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

WILLIAM H. HILL.

Witnesses:

A. P. W001), EDWARD P. W001).

